<!DOCTYPE html>
<html>
<head>
 <title>vue结合原生js实现拖动</title>
<script src="https://cdn.bootcss.com/vue/2.4.2/vue.min.js"></script>
</head>
<body>
<div id="app">
<div class="ctn ctn1">
<!-- draggable=true -->
 <div class="sub sub1" v-for="(site, index) in list1">
 <!-- @mousemove.prevent='mousemove(site, $event)' -->
   <div class="dragCtn fixed" @mousedown="mousedown(site, $event)" @mouseup='mouseup(site, $event)'>
    {{ site.name }}
   </div>
 </div>
</div>
<div class="ctn ctn2">
 <div class="sub sub2" v-for="(site, index) in list2">
   <div class="dragCtn">
    {{ index }} : {{ site.name }}
   </div>
 </div> 
</div> 
</div>
<script>
new Vue({
 el: '#app',
 data: {
 list1: [{name:'拖动我', index:0}],
 list2: [{name:'a', index:0}, {name:'b', index:1}, {name:'c', index: 2}, {name:'d', index: 3}],
 vm:'',
 sb_bkx: 0,
 sb_bky: 0,
 },
 methods: {
  mousedown: function (site, event) {
  var event=event||window.event;
  var _target = event.target
  var startx=event.clientX;
  var starty=event.clientY;
  var sb_bkx=startx-event.target.offsetLeft;
  var sb_bky=starty-event.target.offsetTop;
  var ww=document.documentElement.clientWidth;
  var wh = window.innerHeight;
  if (event.preventDefault) {
   event.preventDefault();
  } else{
   event.returnValue=false;
  };
  document.onmousemove=function (ev) {
   var event=ev||window.event;
   var scrolltop=document.documentElement.scrollTop||document.body.scrollTop;
   if (event.clientY < 0 || event.clientX < 0 || event.clientY > wh || event.clientX > ww) {
    return false;
   };
   var endx=event.clientX-sb_bkx;
   var endy=event.clientY-sb_bky;
   _target.style.left=endx+'px';
   _target.style.top=endy+'px';
  }
  },
  mouseup: function (e) {
  document.onmousemove=null;
  }
 }
})
</script>
<style>
 .ctn{
  line-height: 50px;
  cursor: pointer;
  font-size: 20px;
  text-align: center;
  float: left;
 }
 .sub:hover{
  background: #e6dcdc;
  color: white;
  width: 100px;
 }
  .ctn1{
   border: 1px solid green;
   width: 100px;
  }
  .ctn2{
   border: 1px solid black;
   width: 100px;
   margin-left: 50px;
  }
  .fixed{
  width: 100px;
   height: 100px;
  position: fixed;
  background: red;
  left: 10px;
  top: 15px;
  cursor: move;
  }
</style>
</body>
</html>